How are minerals categorized as either macro or trace?

This is the amino acid cysteine. circle the amine group, put a box aroundthe carboxylic acid group and use a different colored pencil/pen to circle the sidechain (r group). h o | ||nh2— c- c-oh | ch2 | sh

What is the difference between an igneous, sedimentary and metamorphic rock

What factors contribute to the effect an environmental toxin has on the human body?